package com.example.innovate.interceptor;

import com.auth0.jwt.JWT;
import com.auth0.jwt.JWTVerifier;
import com.auth0.jwt.algorithms.Algorithm;
import com.auth0.jwt.exceptions.JWTDecodeException;
import com.auth0.jwt.exceptions.JWTVerificationException;
import com.example.innovate.domain.AdminInfoDO;
import com.example.innovate.domain.SuperAdminInfoDO;
import com.example.innovate.domain.UserInfoDO;
import com.example.innovate.service.AdminService;
import com.example.innovate.service.SuperAdminService;
import com.example.innovate.service.UserService;
import com.example.innovate.token.PassToken;
import com.example.innovate.token.UserLoginToken;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.lang.reflect.Method;

//拦截器

public class AuthenticationInterceptor implements HandlerInterceptor {
    @Autowired
    UserService userService;
    @Autowired
    SuperAdminService superAdminService;
    @Autowired
    AdminService adminService;
    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object object) throws Exception {
        String token = httpServletRequest.getHeader("token");// 从 http 请求头中取出 token
        // 如果不是映射到方法直接通过
        if(!(object instanceof HandlerMethod)){
            return true;
        }
        HandlerMethod handlerMethod=(HandlerMethod)object;
        Method method=handlerMethod.getMethod();
        //检查是否有passtoken注释，有则跳过认证
        if (method.isAnnotationPresent(PassToken.class)) {
            PassToken passToken = method.getAnnotation(PassToken.class);
            if (passToken.required()) {
                return true;
            }
        }
        //检查有没有需要用户权限的注解
        if (method.isAnnotationPresent(UserLoginToken.class)) {
            UserLoginToken userLoginToken = method.getAnnotation(UserLoginToken.class);
            if (userLoginToken.required()) {
                // 执行认证
                if (token == null) {
                    throw new RuntimeException("无token，请重新登录");
                }
                // 获取 token 中的 username
                String username;
                try {
                    username = JWT.decode(token).getAudience().get(0);
                } catch (JWTDecodeException j) {
                    throw new RuntimeException("401");
                }
                UserInfoDO userInfoDO = userService.getUserByName(username);
                SuperAdminInfoDO superAdminInfoDO = superAdminService.getAdminByName(username);
                AdminInfoDO adminInfoDO = adminService.getAdminInfoByName(username);
                if (userInfoDO == null && superAdminInfoDO == null && adminInfoDO == null) {
                    throw new RuntimeException("用户不存在，请重新登录");
                }
                // 验证 token
                if(userInfoDO!=null){
                    JWTVerifier jwtVerifier = JWT.require(Algorithm.HMAC256(userInfoDO.getUserInfoPassword())).build();
                    try {
                        jwtVerifier.verify(token);
                    } catch (JWTVerificationException e) {
                        throw new RuntimeException("401");
                    }
                }
                else if(superAdminInfoDO!=null){
                    JWTVerifier jwtVerifier = JWT.require(Algorithm.HMAC256(superAdminInfoDO.getAdminPassword())).build();
                    try {
                        jwtVerifier.verify(token);
                    } catch (JWTVerificationException e) {
                        throw new RuntimeException("401");
                    }
                }
                else{
                    JWTVerifier jwtVerifier = JWT.require(Algorithm.HMAC256(adminInfoDO.getAdminPassword())).build();
                    try {
                        jwtVerifier.verify(token);
                    } catch (JWTVerificationException e) {
                        throw new RuntimeException("401");
                    }
                }
                return true;
            }
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {

    }
    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {

    }
}
